title: Broadening of the light self-trapping due to thermal defocusing in PQ-PMMA polymeric layers.
abstract: The channel formation by the self-trapping of a (1 + 1)D beam in polymeric media based on a polymethylmethacrylate (PMMA) matrix containing phenanthrenequinone (PQ) molecules is predicted theoretically and observed experimentally for the first time. Particular attention is paid to the effect of thermal beam expansion, which in conjunction with the photorefractive nonlinearity of the medium results in the possibility to control optically the geometrical parameters of the generated channel.
authors.affiliation: Institute of Applied Optics, Friedrich-Schiller-University Jena, Froebelstieg 1, 07743 Jena, Germany. elen.tolstik@uni-jena.de
authors.forename: E
authors.initials: E
authors.lastname: Tolstik
authors.forename: O
authors.initials: O
authors.lastname: Kashin
authors.forename: V
authors.initials: V
authors.lastname: Matusevich
authors.forename: R
authors.initials: R
authors.lastname: Kowarschik
mesh_terms: D003198:Computer Simulation; D006358:Hot Temperature; D008027:Light; D008956:Models, Chemical; D019904:Polymethyl Methacrylate / Q000737:chemistry*; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation
chemical_list: D019904:Polymethyl Methacrylate